Not connecting to xbox live

My xbox is not connecting at all. I have tried every trouble shooting step and nothing is working. i've changed the ip address and everything. i even have the telephone company come and give me a new wireless router. Which the router is hooked into the computer
the router acts like a modem and a router. and i have tried everything i even hooked up my borthers xbox to it and his didn't even work. hope to get this issue resolved asap. all the help i can get PLEASE!

Question Info

Could you answer the following questions from the "Start Here" sticky on the main page?

What Country/State/Province do you live in?
Modem brand & model number:
Router brand & model number:
Network Connection Type: Wireless/Wired
If Wireless, what type of encryption are you using?
If Wireless, are you using a white or black external adapter, or an internal (Xbox 360S) adapter?Things you have tried: Is UPnP Enabled? Yes/no/UnknownIs NAT Type Open? Any Error Codes you encounter: What type of internet do you have? Cable/DSL/T1/3G? Who is your ISP(Internet Service Provider)? After you run "Test Xbox LIVE connection" and click on "More info", what is the exact message shown on screen?